Effects of environmental heart on performance and some physiological responses of a man during a psychomotor task

H G Wenzel, R Ilmarinen
Journal of Human Ergology 1977, 6 (2): 139-52
In climatic chamber experiments some physiological responses of a young healthy man were studied. He was able to perform a pursuitmeter task in a fairly wide range of warm climates without decrement of performance. The highly trained and heat-acclimatized subject was exposed nearly undressed to various ambient temperatures (28--55 degrees C) and air humidities (10--92%) which were combined in such a way that the conditions were tolerable up to 4 h. In 18 experiments the man was sitting quietly all the time, and in a parallel series of 19 experiments (up to 50 degrees C) he performed the pursuitmeter task during the last 2 hours of each exposure. Under equal climatic conditions work caused a slight increase in oxygen uptake corresponding to an increase in metabolic heat generation by about 70 kj/h (17kcal/h) on the average. Rectal temperature and temperature next to the eardrum were 0.1--0.2 degrees C higher at work as compared with rest. Weight loss at work exceeded weight loss at rest, the difference ocrresponding to an increase in evaporative heat loss by about 110 kj/h (26 kcal/h) which resulted in a decrease of mean skin temperature of 0.5 to 0.9 degrees C. Superelevation of heart rate due to work reached about 10 beats/min in a thermally neutral environment, but up to 30 beats/min in hot dry and warm humid surrounding, reflecting the additional effort for maintaining performance under conditions of increasing heat stress.

Full Text Links

Find Full Text Links for this Article


You are not logged in. Sign Up or Log In to join the discussion.

Trending Papers

Remove bar
Read by QxMD icon Read

Save your favorite articles in one place with a free QxMD account.


Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"